Gas filter



July 9, 1940.

sheets-sheet 1 Filed June 16, 1939 5mn J.Mwco-4veu, man aoalwezs,

@M @s fw V www:

July 9, 1940.

R. W. DUCKER ET AL GAS FILTER Filed June 16, 1939 2 sheets-sheet 2 l, Sjwuamfws Rose-nr nc baars, 00N B. aoyos TUN, NRL J.Mco1wvs,

ann a Dwang-Ls,

Patented July 9, 1940 I 2,207,66@

UNITED STATES PATENT OFFICE GAS FILTER Robert W. Ducker, Don E. Boydston, Earlv J. McConnell, and Carl U. Daniels, Tulsa, Okla., assignors to Oklahoma Natural Gas Company, Tulsa, Okla.

Application June 16, 1939, SerialtNo. 279,574

6 Claims. (Cl."183--47) Our invention consists in new and useful imour invention resides in the novel features hereprovements in gas filters and relates more parinafter set forth., illustrated in the accompanyticularly to the removal of microscopic dust par-y ing drawings and more particularly pointed out ticlcs transported by natural gas flowingv in high in the appended claims.

5 pressure transmission mains. Referring to the drawings in which numer- It is the prmary object of the invention to als of like character designate similar parts provide a simple, economical and efficient device throughout the several views.

Wliich may be installed in a gas pipe line or the Fig. .l is a vertical sectional view showing our like for removing dust,y rust and other foreign improved iilter unit assembled with the filtering l substances which are entrained in the gas. ele-nient compressed. 1o

Ilreretofore, various efforts have been made to Fig. 2 is a similar view showing the unit before remove pipe line dust consisting principally of the filtering element is compressed. iron oxide of extremely fine texture, such for ex- Fig. 3 is an enlarged horizontal section taken ample as passing the gas through oil bath cleanon line 3--3 of Fig. 1, and

l5 ers or scrubbers, and although this type of filter l Fig. 4 is an enlarged detail of the members 15 is quite generally used throughout the industry, forming the filter holder. it has been found that the'high cost of the equip- In the drawings, l repleSerltS Cylindrical ment per unit of capacity and the high operacasing of any suitable diameter', having an inlet tion and maintenance costs render such method conduit 2 towards its lower end and an outlet u objectionable from an economic standpoint. conduit 3 towards its upper end, a conventional 20 .in order to overcome this objection, certain cleanout opening fl being provided adjacent the attempts have been made to employ compressibottom oi the casing. The upper end of the le iilters for removing dust particles and the casing l is closed by a removablecover or head like .from gas but these have been structurally 5 of any convenient form.

deiicient by reason of the tendency of the gases At a substantially central point on the inner 25 to channel the edges of the lter and by-pass Wall of the casing l, au annular flange 5 S the iiltering material, thus failing to effectively welded or otherwisesecured to form a support- "iter out all of the entrained foreign matter. ing shoulder for the filter element holder. As

The present invention is the result of considwill best be seen from Fig. 4,the lower member 3l) era-ble experimentation and is directed to the of the holder consists of a truncated cone 'I of 30 compressible type of filter having for its main suitable wire mesh having a flat outer ring 8 object to overcome the disadvantages l above adapted to rest upon the fiange ii when installed noted. To this end, we have provided an adjustin the casing. A cross bar 9 extends across the able. unit which is so constructed yas to insure central portion of the ring 8 and supports a ver- ;55 a proper sealing of the edges of the filtering tical rod IU which extends through the trun- 35 material against the inner Walls of the casing, cated cone 'i and terminates adjacent the upper thus preventing the by-passing of the gas around end of the casing l, said rod I0 being welded or the edges of the filter, while at the same time so otherwise fixed to the cross bar 9 and top porcontrolling the compression that the center portion of the truncated cone member 'I.

40 tion of the filter-element will not be unduly com- A disc or wire mesh II stretched across a 40 pressed, thereby avoiding the disadvantage of strengthening ring I2 is free to slide on the rod compacting the entire element. l0 above the truncated cone 'I and, as will later A further object of the invention is to provide appear, serves as the upper compression member in a filtering unit, a filter element preferably of the holder. l g5 of sp-un glass wool or the like made A tube I3 is slidably arranged on the rod vIII 45 or two c ctions so shaped as to cooperate with above the disc I I, said tube carrying at its lower the compressing members to more effectively acend a ring It supported by straps I5 for concomplish the sealing of the edges of the filter tacting the upper surface of the disc I I. This against the walls of the easing. tube is adjustable on the rod I0 and may be A still further object of our invention resides locked in adjusted POSOII by Suitable Sel? 50 in' the simplicity of construction and the ease screws I6, or other convenient means. with which the device may be assembled, dis- The f-Llter element is interposed between the assembled and adjusted. truncated cone I andthe disc II and is prefer- Wth the above and other objects in view ably composed of two sections of `spun glass wool which will appear as the description proceeds,y Ila. andy iIb. As will be seen fromY Fig. 2, these 55 sections are of oversize diameter with respect to the casing. 'I'he lower section Ila, is in the form of an annular ring which ts between the sides of the wire mesh truncated cone 'I and the walls of the casing and before being compressed extends substantially above the top of the cone l. The upper section I'Ib is in the form of a disc which surrounds the rod I0 and rests on top of the lower section.

In installing and assembling this unit, the truncated cone member 1 is inserted through the top of the casing I until the ring 8 rests upon the flange E in the casing. We then insert the iilter element sections I'Ia and I 1b. The wire mesh disc II is then placed on the rod I0 on top of the two filter sections, after which the tube I3 is slipped on the rod Ill and lowered until the ring Ill rests upon the top of the disc II.

The tube I3 and ring I4 are then forced downivardly until the bottom of the upper lter section I'Ibl rests upon the top of the truncated cone 1. Thus, as the tube I3 and ring I4 are moved downwardly as just described, lower element I'Ia and the outer edges of the upper element I'Ib are compressed, and by virtue of the sloping sides of the cone l, the edges of the ltering medium are compressed outwardly against the inner wall of the casing I, leaving the central portion of the disc I'Ib substantially uncompressed. The set screws I6 are then screwed into engagement with the rod I I) to lock the com-l pressed filter element at the proper compression.

It will thus be seen that due to the shape of the truncated cone which serves as the inlet holder, differential pressure across the filter ring normal to the wall of the iilter body assists materially in effecting the seal, it being understood that at no point is the filter material tightly compressed. In other words, it is our purpose to lightly compress the edges only of the iilter element for the denite purpose of preventing flow around the edges and to retain a substantial portion of the sectional area of the filter relatively uncompressed, and we have found that this is facilitated by the shape o-f the truncated cone I and the use of the above described oversize filter sections.

It will be understood thatA this assembly is installed in a gas pipe line by connecting the inlet and outlet conduits 2 and 3, respectively into the line at a suitable point.

While we have referred particularly to spun glass wool as the lter medium used in connection with our invention, it will be understood that other suitable media may be employed if desired. Furthermore, while we have described the filter element as preferably composed of two sections, we do not intend to limit ourselves in this respect as the filter element may be constructed in one section if properly shaped.

' From the foregoing it is believed that the construction and advantages of our improved filter may be readily understood by those skilled in the art ,without further description, it being borne in mind that numerous changes may be made in thev details disclosed without departing from the spirit of our invention as set out in the following claims.

What we claim and desire to secure by Letters Patent is:

1. In a gas filter including a casing having inlet and outlet openings, a filter element interposed between said openings comprising a perforate base member substantially in the form of a truncated cone, a perforate disc member coaxial with said base member, a normally oversize.

mass of compressible filter medium interposed between said members and surrounding said base member, and means for'moving one of said members toward the other to compress the outer edges of said filter medium against the inner wall of said casing.

2. In a gas filter including a casing having inlet and outlet openings, a filter element interposed between said openings comprising a perforate base member substantially in the form of a truncated cone, a perforate disc member coaxial with said base member, a pair of normally oversize sections of compressible lter medium interposed between said members, one of said sections consisting of an annular ring adapted to encircle said base member, and the other section consisting of a disc adapted to rest on top of said first named section, and means for ber, one of said members being movable with re-- spect to the other, a pair of normally oversize sections of compressible filter medium inten' posed between said members, one of lsaid sections consisting of an annular ring adapted to encir- ,Q cle said truncated cone, and the other section consisting of a disc adapted to rest on top of said n first named section, said movable member adapted to compress the outer edges of said oversize sections around said cone member and against the inner wall of said casing to integrate said sections.

4. In a gas filter including a casing having inlet and outlet openings, a filter element inter-v, posed between said openings comprising a truncated cone of wire mesh, means for supporting said cone in said casing, a wire mesh disc ar` ranged coaxial with and movable with respect to said cone, a pair of normally oversize sections v of compressible iilter medium interposed between said disc and cone, one of said sections consisting of an annular ring adapted to encircle said cone, and the other section consisting of a disc adapted to rest on top of said rst named section, and means cooperating with said wire mesh disc for moving the latter axially toward said cone to compress the outer edges of said oversized sections around said cone and against the inner wall of said casing.

5. In a gas filter including a casing having inlet and outlet openings, a lter element interposed between said openings comprising a truncated cone of wire mesh, means for supporting said cone on the inner wall of said casing, an

axial guide rod carried by said cone, a wire mesh disc slidable on said guide rod and movable with respect to said cone, a pair of normally oversize sections of compressible filter medium interposed between said cone and said disc, one of said sec-A tions consisting of an annular ring adapted to encircle said truncated cone, and the other` of said sections consisting of a disc adapted to restv on top of said first named section, a sleeve slidable on said guide rod, a yoke carried by said sleeve in abutting relation tothe outer face of said disc, whereby axial movement of said sleeve` in one direction will cause compression of the edges of said sections of lter medium around said truncated cone and against the inner wall of said casing, and means for locking said sleeve in compressing position.

6. In a gas filter including a casing having inlet and outlet openings, a filter element interposed between said openings comprising a perforate base member substantially in the form of a truncated cone, a perforate disc member co-v axial with said base member, a normally oversize mass of compressible lter medium interposed between said members and having an annular portion surrounding said base member, and means for moving one of said members toward the .other to wedge said annular portion between said base member and the inner wall of said casing, Whereyby the escape of gas past the outer edges of said filter medium is prevented.

ROBERT W. DUCKER. DON B. BOYDSTON.4 EARL J. MCCONNELL. CARL U. DANIELS. 

